Electromagnetic tool



Dec- 15 1925- N. JAPOLSKY ELECTROMAGNETIC TOOL Filed Jan. 13, 1925 2 Sheets-Sheet 1 Dec. 15, 1925- N. JAPOLSKY ELECTROMAGNETIC TOOL Filed Jan. 13. 1925 2 Sheets-Sheet 2 Figlz BATENT Q??? NICOLAS JAPOLSKY, 0]? LONDON, ENGLAND.

ELECTROMAGNETIC TOOL.

Application filed January 13, 1925. Serial nearer.

To c]! whom, may concern:

Be it known that I, NIooLAs JAPOLSKY, a citizen of Russia, and residing at 68a, Lincolns InnFields, London, lV. C. 2, England, have invented a certain new and useful Improved Electromagnetic Tool, of which the following is a specification.

This invention relates to electromagnetic tools of the kind in which the active member is reciprocated.

The object of the invention is to provide an improved construction of electromagnetic hammer, borer or the like reciprocating tool.

The invention consists in electromagnetic tools of the kind in which the active memher reciprocates characterized in that the said rcci nfbcatinp; member is an electric conductor which is arranged in the air gap of a magnetic circuit of constant polarity and is traversed by an alternating current, the action of which on the field in the air gap proditices the reciprocation ot the said member. s

The invention also consists in the further features hereinafter described and claimed.

Reference will now be made to the accompanying); diagrammatic views which illustrate by way oi examples different forms of electromagnetic devices according to the invention.

In these drawinpgsz- Figure 1 shows diagrammatically one construction ot reciprocating; tool.

Figure 2 is a modification of the arrangementaccording: to Figure 1.

Figure 3 shows another form of construct ion.

hip ure l shows a detail of same.

liigrures 5 and 6 are modifications of the loreuoing.

Figures 7. 8, 9 and 10 show three further diagrrunnnatic arrangements.

Figures 11 and 19 show a sixth constructive arrangement and Figures 13 and 14: show a seventh arrangemont.

In the diagram, Figure 1, the tool comprises an electromagrnet A, which is fed by a continuous electric current by means of the terminals 1 and 2. B is the active memher which is made of electric conducting material and. is adapted to reciprocate, being connected by flexible conductors 5 and 6 to terminals 3 and 4: of the secondary winding of an alternating current transformer T.

C represents a small impact member that is intended to perform the work of the tool and is acted upon by the reciprocative men1- her B.

The electromagnet A produces a constant magnetic field with poles N and S, in the air gap of which the active member B is situated. The member B is traversed by an alternating current, the action of which upon the magnetic field causes the displacement of the member B in a reciprocating manner in order to actuate the impact member C.

In the modification according to Figure 2 the flexible conductors 5 and 6 are dispensed with and are replaced by fixed guides D, each of which is connected to one of the terminals 3 and 4; of the secondary winding of the transformer T.

The active member B is adapted to move in the guides D with which it makes good conductive contact.

Referring to Figures 3 and 4 these illustrate a constructivearrangement in which the active member B itself constitutes the secondary of a transformer T, the core T and the closed magnetic circuit of which are fixed. As in the previous example'the reciprocative member B is traversed by an alternating current, the action of which upon the magnetic field produced in the gap between the poles N and S causes the reciprocating movement of the member B which in turn transmits its energy to the impact member C. The member B seen in plan in Figure i is provided with a central opening B through which is linked the magnetic core oi the transformer T.

In a modification of the above arrangement and shown in Figure 5 the member B comprises a fixed portion B that is provided with two guides B In these guides is adapted to slide the movable part B which at the same time remains in good electrical contact therewith.

The movable part B being traversed by an alternating current, its action upon the constantmagnetic field causes the reciproeating displacement of the part 13 V In the arrangement shown in Figure 6 the member B is fixed and is connected to the movable portion B by the flexible conductors B The arrangement according to Figure 7 differs from the preceding forms in that the part B is subjected to the action of two con stantmagnetic fields produced the one by the electromagnet A and the other by the electromagnet A T is the core of the transformer T which is looped with the member B, while (l represents the impact member.

In the modification shown in Figure 8 the windings that produce the constant magnetic field and the primary winding of the transformer having an alternating current T are arranged on a common magnetic core A. For this purpose a continuous current led to the terminals 1 and 2 traverses the four windingsI, II, I and II which are arranged in such a manner that'their magnet-ic fluxes follow the courses indicated by the dotted lines o. Vith regard to' the alternating currents these are led from the terminals 3 and 4 and traverse the two primary windings III, IV, the magnetic fluxes of which, in the same direction follow the course of least resistance, that is to say the coursea. The secondary of the transformer, as in the preceding case, is formed by the active part B which has in plan the shape illustrated in Figure 9. The continuous current circuit could comprise two more windings arranged on the polar parts N and S, in such a way as to increase the fiuxtraversing the same.

The further modification shown in Figure 10 is similar to that shown in Figures 8 and 9, but in this case the active member B is arranged in a plane perpendicular to the direction of its movement; moreover the impact member C traverses a hole provided in the core A while the member B works on this core by means of the opening B which is provided in the centre part of the main core A.

In the arrangement according to Figures 11 and 12, the magnetic core A of the transformer is provided with a central branch A along which the active member B can be displaced. The member B is seen in front view in Figure 12. The continuous current windings I and II are arranged on the central branch A in such a manner that their fluxes Z) have opposite directions in the same; the alternating current windings III and IV are also arranged on the branch A but in such a manner that their flueX assist one another.

In the arrangement according to Figures 13 and 14 A represents a magnetic cylinder which is provided with a central longitudinal branch A At each extremity of this branch is arranged a continuous current winding I, II respectively, the fluxes b of which are directed in opposite directions in the branch A Along the latter is displaceable the active member B which is constituted by an electric winding connected by the flexible connections B to a source of alternating current not illustrated. The interior of the branch A, is hollow and contains a' guide 0, intended to act on the impact member C. This guide is connected to the movable member B by the cross member B that moves in the slits in the branch A Having now described my invention, what I claim as new and desire to secure by Let ters Patent is 1. An electromagnetic tool comprising in combination an electromagnet of constant polarity having an air gap, a reciprocative member which is an electric conductor, arranged in the air gap, and means for supplying alternating current to said member to cause in the air gap its reciprocation;

2. An electromagnetic tool as claimed in claim 1, in combination with a transformer the core and the primary winding of which are fixed, the reciprocating member constituting, in part at least, the secondary winding.

In testimony whereof I have signed my name to this specification.

NICOLAS J APO-LSKY. 

